<template>
  <ul>
    <li :style="{opacity}">欢迎学习 Vue</li>
    <li>news001 <input type="text"> </li>
    <li>news002 <input type="text"> </li>
    <li>news003 <input type="text"> </li> 
  </ul>
</template>

<script>
  export default {
    name:'News',
    data(){
      return {opacity: 1}
    },
    activated(){
      this.timer = setInterval(() => {
        console.log('@')
        this.opacity -= 0.01
        if(this.opacity <= 0) this.opacity = 1
      }, 16)
    },
    deactivated(){
      clearInterval(this.timer)
    }
  }
</script> 